.auth-page{min-height:calc(100 * var(--vh));background:var(--color-bg-app);justify-content:center;align-items:center;padding:32px 16px;display:flex}.auth-card{background:var(--color-surface);border:1px solid var(--color-border-subtle);border-radius:var(--radius-lg);width:100%;max-width:400px;box-shadow:var(--shadow-md);flex-direction:column;gap:18px;padding:32px 28px 28px;display:flex}.auth-brand{color:var(--color-text-primary);font-family:var(--font-serif);align-items:center;gap:10px;font-size:20px;font-weight:600;text-decoration:none;display:flex}.auth-brand-mark{border-radius:var(--radius-sm);background:var(--color-primary);color:#fff;justify-content:center;align-items:center;width:34px;height:34px;display:inline-flex}.auth-brand-mark .icon{stroke:currentColor;fill:none;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;width:18px;height:18px}.auth-title{font-family:var(--font-serif);color:var(--color-text-primary);margin:0;font-size:24px;font-weight:600;line-height:1.25}.auth-subtitle{color:var(--color-text-secondary);margin:4px 0 0;font-size:14px;line-height:1.5}.auth-form{flex-direction:column;gap:14px;display:flex}.auth-field{flex-direction:column;gap:6px;display:flex}.auth-label-row{justify-content:space-between;align-items:baseline;display:flex}.auth-label{color:var(--color-text-primary);font-size:13px;font-weight:600}.auth-input{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);height:42px;color:var(--color-text-primary);font-family:var(--font-sans);padding:0 12px;font-size:14px;transition:border-color .15s,box-shadow .15s}.auth-input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light);outline:none}.auth-hint{color:var(--color-text-secondary);font-size:12px}.auth-submit{width:100%;height:42px;margin-top:4px}.auth-submit:disabled,.auth-google:disabled{opacity:.6;cursor:not-allowed}.auth-google{background:var(--color-surface);width:100%;height:42px;color:var(--color-text-primary);border:1px solid var(--color-border)}.auth-google:hover:not(:disabled){background:var(--color-surface-hover)}.auth-google svg{flex-shrink:0;width:18px;height:18px}.auth-divider{color:var(--color-text-secondary);align-items:center;gap:12px;font-size:12px;display:flex}.auth-divider:before,.auth-divider:after{content:"";background:var(--color-border-subtle);flex:1;height:1px}.auth-message{border-radius:var(--radius-sm);padding:10px 12px;font-size:13px;line-height:1.45}.auth-message.error{background:var(--color-error-bg);color:var(--color-error)}.auth-message.success{background:var(--color-success-bg);color:var(--color-success)}.auth-link{color:var(--color-primary);font-weight:500;text-decoration:none}.auth-link:hover{text-decoration:underline}.auth-link-button{font:inherit;cursor:pointer;background:0 0;border:none;padding:0}.auth-footer{text-align:center;color:var(--color-text-secondary);font-size:13px}.auth-card.wide{max-width:520px}.auth-select-row{grid-template-columns:1fr 1.4fr 1.1fr;gap:10px;display:grid}.auth-select{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);height:42px;color:var(--color-text-primary);font-family:var(--font-sans);padding:0 10px;font-size:14px}.auth-select:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light);outline:none}.auth-check{color:var(--color-text-primary);cursor:pointer;align-items:flex-start;gap:10px;font-size:14px;line-height:1.45;display:flex}.auth-check input{width:16px;height:16px;accent-color:var(--color-primary);flex-shrink:0;margin-top:3px}.auth-section{border-top:1px solid var(--color-border-subtle);flex-direction:column;gap:10px;padding-top:14px;display:flex}.auth-section h2{font-family:var(--font-serif);color:var(--color-text-primary);margin:0;font-size:18px;font-weight:600}.auth-body{color:var(--color-text-primary);margin:0;font-size:16px;line-height:1.55}.auth-body.muted{color:var(--color-text-secondary);font-size:14px}.auth-list{color:var(--color-text-primary);flex-direction:column;gap:4px;margin:0;padding-left:18px;font-size:16px;line-height:1.5;display:flex}.auth-actions{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.auth-actions .btn{height:42px}.auth-actions .spacer{flex:1}.verify-valid{color:var(--color-success);margin:0;font-size:14px;font-weight:700}.verify-course{font-family:var(--font-serif);font-size:18px;font-weight:600}.verify-small{color:var(--color-text-secondary);margin:8px 0 0;font-size:12px;line-height:1.5}.legal-page{cursor:pointer}.legal-page .legal-card{cursor:auto}.legal-top{justify-content:space-between;align-items:center;gap:12px;display:flex}.legal-back{font-size:14px}.signin-modal-backdrop{z-index:1100;background:#11100f73;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.signin-modal{box-sizing:border-box;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);width:100%;max-width:400px;max-height:100%;box-shadow:var(--shadow-lg);flex-direction:column;gap:18px;padding:28px 28px 24px;display:flex;position:relative;overflow-y:auto}.signin-modal .auth-subtitle{margin-top:-12px}.signin-modal-close{border-radius:var(--radius-sm);width:32px;height:32px;color:var(--color-text-secondary);cursor:pointer;background:0 0;border:none;font-size:22px;line-height:1;position:absolute;top:10px;right:12px}.signin-modal-close:hover{background:var(--color-surface-hover);color:var(--color-text-primary)}.auth-email-btn{border:1px solid var(--color-border)}.auth-code{font-family:var(--font-mono);letter-spacing:.3em;font-size:18px}.auth-code-actions{flex-wrap:wrap;justify-content:space-between;gap:12px;margin:0;display:flex}.auth-link-button:disabled{color:var(--color-text-secondary);cursor:default;text-decoration:none}